I'am with Chad on this one.I would not polish the glass for two reason,one that will not provide any type of protection for your bow,unless you don't mind waxing the glass about every other time you use your bow.Two would be just as Chad mentioned,once polished nothing will stick to it.Even new finish.I sand the clear glass with 220 grit dry sandpaper gently.And then apply new finish.Once the finish comes in contact with the sanded glass it will be almost cystral clear....New finish will make the glass clearer then polishing...bowdoc